Owner Robert Kraft described the victory as "unequivocally the sweetest."

AP Photo/Steven Senne

The newest banner, right, commemorating the New England Patriots’ Super Bowl 51 victory, joins the other four as it is unveiled at Gillette Stadium before an NFL football game between the Patriots and the Kansas City Chiefs, Thursday, Sept. 7, 2017, in Foxborough, Mass.

The Patriots revealed the Super Bowl LI banner before the 2017 season opener against the Kansas City Chiefs. The team had to do some minor renovations of their home stadium to make room for the fifth banner.

Commissioner Roger Goodell was on the field before the game, which was also the opener for the NFL season. With New England fans still angry about Goodell's "Deflategate" investigation, he received a chilly welcome.

Fans booed him and wore shirts featuring his face adorned with a red clown nose. A website handed out thousands of towels with the image, too.